[diek]

You may deploy your application package (however that is packaged up), but what happens when a hard drive starts to die? It may not _die_, it just may have elevated write latency. What about a RAID controller firmware having issues above a certain IOPS threshold? What about a critical kernel security patch that has to go out, and your application runs on 1,000 servers?

None of those things are related to your code directly, but may interact with it at some level. At some point, you get so far removed from the work on your actual application that it makes sense to move that to another 'Infrastructure' group.